Blacet Research Time Event Modulator EG3870 User & Assembly Manual Download Page 8 | Manualshive

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Blacet Research Time Event Modulator EG3870 User & Assembly Manual Download Page 8

Page 8

Testing

Connect a +/-15 V bipolar regulated power supply (such as the PS505 or PS800) to the board. Make sure that the
connector is properly

positioned on the header. Do not make the power connection to the board with the power supply

turned on. These measures will help avoid damage to the unit!
Use your DMM to monitor the +15V supply, using the left side of diode near the top of the power connector for common
and the right side for +15V.
Apply power. If your DMM does not indicate 15V or so, remove the power.
If +15 is present, check the -15 at the right side of the bottom diode under the power connector.
Check the ICs carefully to see if any are hot (they should not be). Are there any funny smells? If anything seems amiss,
remove the power.

Calibration

No further calibration is necessary.

Troubleshooting,

Repair, Warranty

Most problems are caused by assembly errors.

Don’t panic!

Take a break, then check solder joints for good connection (no “cold” joints?), check for a blob of solder causing a short,
check all component locations and polarities, and check for the possibility of a   broken trace or a hairline short caused by
under etching of the PCB, especially around the pots.
If  you  encounter  problems  that  you  can’t  solve, contact  us, preferably via  e-mail with  a description of  the  problem.  Let us
know what does and  does not work. We can then help you  get your module working. We can also fix  modules mailed to us
for a minimum fee of $29 (if not covered by warranty).

Contact us for an RMA before shipping.

The parts contained  in this unit have  been carefully selected and  tested. They are guaranteed  for  one  year  from  the date of
purchase.  If  you believe  that  you  have  a  defective part  (or  if  you  have  a part  missing),  contact  us  so  we can  provide  you
with a replacement or repair. Include your name and invoice number.
Store  your  Manual in  a secure  location and  never, ever  throw it  away! It is the  best  information  available for  your revision
of this module.

Manuals must be transferred to the new owner anytime you sell a module.

We reserve the right to void the warranty or refuse to service any module that has been built with parts not supplied by
us, modified in any way, subjected to abuse, or damaged beyond repair.

Assembly Documents

• Parts list
• Schematic
• PCB drawing

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Summary of Contents for Time Event Modulator EG3870

Page 1: ...ents Copyright Reproduction by any means including the Internet prohibited without permission This document contains proprietary and trade secret information of Blacet Research and is provided as a service to the module owner Any unauthorized duplication or transferral may violate trade secret laws Contents subject to change without notice Time Event Modulator VC DADSR ...

Page 2: ...lly control the ADSR segments The Delay section allows 0 to 10 seconds of delay before the envelope starts A wide variety of outputs include Full and Inverted envelopes as well as an attenuated envelope Two pulse signals EOA and HPP can be used to trigger external modules such as the Blacet EG2070 in AD mode or the DAD2970 The EOR gate output can also be used to control external modules ...

Page 3: ...not elapsed There are two responses of the Delay depending on if the gate is held active momentarily or throughout the delay period In the first case the delay will proceed automatically then trigger the AD cycle ending at the Sustain Level This will be held until the next Gate is applied and held as in case 2 Setting the Sustain level at 0 will give an AD style envelope In the second case the env...

Page 4: ...S pulse and activates LED2 EOR is simply the envelope output inverted by comparator U5a which is set to 50 mV by R33 and R34 The output level LED1 is driven by a voltage to current converter U5d which gives a more accurate visual display D1 is a shottky diode which clamps any negative excursions of all the envelopes to about 0 2V R11 Output Level and non inverting op amp U12c multiply the 5V nomin...

Page 5: ...of the board Be sure to follow directions Use the ref des column on the Parts List to locate components The Type and Value fields will often have the part marking in xx We advise inserting components in groups according to type checking them and then soldering the group This will help avoid errors Solder one leg of components first then come back and do the other leg later This practice avoids dis...

Page 6: ... first pushing a bit forward to get the rear pins in place Solder only the front pin while applying a bit of pressure to the PCB in the vicinity of the jack Do all the jacks and check the mounting before soldering any other pins Close one eye and sight down the row of jacks Each jack must be flush to the board and have no tilt from front to back When everything looks perfect solder the other pins ...

Page 7: ...with the longest leg next to the triangular PCB marking Solder ICs Use a static free work station or wrist strap when installing the ICs Observe correct orientation Install the ICs now as they will be less accessible once the PCBs are mounted to the front panel Make sure all the legs are straight and are actually going into the socket before seating the IC Front Panel Work on a soft towel to avoid...

Page 8: ...polarities and check for the possibility of a broken trace or a hairline short caused by under etching of the PCB especially around the pots If you encounter problems that you can t solve contact us preferably via e mail with a description of the problem Let us know what does and does not work We can then help you get your module working We can also fix modules mailed to us for a minimum fee of 29...

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